Joel davis hall



(No Model.) l

J. D. HALL.

MAOHINE TOR SHANPNNINO OOTTON GIN SAWS'. NO. 247,049. Patented Slept.13,1881.

` gli INVENTOR ATTORNEYS.

WTTNESSES:

UNITED STATES PATENT OFFICE.

JOEL DAVIS HALL, OF KINGSTON, GEORGIA.

MACHINE FOR SHARPENING COTTON-GIN SAWS.

SPECIFICATION forming part of Letters Patent No. 247,049, datedSeptember 13, 1881.

Application led June 3, 1881. (No model.)

citizen of the United States, residing at Kingston, in the county ofBartow and State ofGeorgia, have invented a new and useful Improvementin Machines for Sharpening Cotton-Gin and other Saws, of which thefollowing is a full, clear, and exact description, reference being had'to the drawings hereto annexed.

The object of my invention is to provide a gummer or Sharpener which canbe operated to sharpen saw-teeth with speed and precision.

Inthe accompanying drawings, Figure l represents a perspective view ofmy invention; Fig. 2, a central longitudinalfsection, and Fig. 3 adetail view.

The base A of the machine, consisting of sills resting upon the ground,is provided with standards a a of adjustable height for. supporting theshaft a', which carries the serrated disk or saw to be led. Extendingabove and on both sides of said shaft is the frame B, which rests uponcross-ties connecting the sills, and is firmly secured thereto. To oneend of the frame, on the under side, are secured two parallel rods, b b,which extend above shaft a', on opposite sides ot' the saw a2, and arecurved downward and rigidly attached to a cross-piece at the oppositeend of the frame. Upon these rods a frame, C, which carries the rotatingtile c, is made to slide to and fro intermittingly by means of aspring,c, which tends to draw it in o edirection, and an arm, c2, whichengages will) a helical incline, d, on the driving-shaft D, to force itin the opposite direction. In the center of said frame C is a,gear-wheel, c3, meshing with wheel d on the said sliding frame isfurther provided with a guard, c6, which projects along the side of thesaw opposite to the direction of the rotation of the le, for supportingthe saw and holding it firmly against the file. At the opposite end ofthe frame is the feeder E, which consists of a disk cut to the center atone point and having one ot' the cut edges helically inclined, so thatwhen it is rotated by means of shafts e and D and gear-wheels e ande2 itwill at each revolution engage with the next succeeding tooth of thesaw, and thereby cause it to rotate intermittingly. In this manner thesaw will'be fed to the iile, the sliding intermittent movement ot' thelatter being set to correspond 'with the revolution of the feeder.

On the top of the main frame is a curved brace, f, reaching across fromside to side, and havingtwo down ward-projectinglngs on its under side,near the center, to forni a bifurcated guard, f', into which thesaw isadjusted to prevent lateral movement. A suitable brace arranged in likemanner is to be provided with horizontal guards, between which the upperpart of the sliding frame shall be confined.

The driving-shaft D is provided with a crank and pulley, whereby it maybe rotated either by hand or by steam or other power.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of shaft a', adapted to support a saw, the feeder E,supported in one end of 'the main frame, the bit'urcated guard f', andthe sliding frame C, having file c and guard c6, and suitable mechanismfor operating the le, substantially as shown and described.

2. The rotating lile c, mounted upon a nearly-vertical shaft, incombination with the intermittingly-sliding frame C, having guard c,substantially as shown and described.

JOEL DAVIS HALL.

Witnesses:

W. A. GILLAM, L. BURROUGH.

